Acquisition of a 400-MHz Solid-State NMR Spectrometer for Investigations of Synthetic and Naturally Occurring Polymers

购买 400 MHz 固态核磁共振波谱仪用于研究合成和天然存在的聚合物

• 批准号: 0116430
• 负责人: Klaus Schmidt-Rohr
• 金额: $ 25.98万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0116430&HistoricalAwards=false
• 关键词: Acquisition; 400; MHz; Solid; State

The new 400-MHz solid-state nuclear magnetic resonance (NMR) spectrometer supported by this Major Research Instrumentation award will enable an interdisciplinary team of researchers at Iowa State University to characterize complex polymeric materials in unprecedented detail. Multidimensional NMR in particular will be applied to provide detailed and quantitative information on the chemical structure, conformations, inter segmental distances, and reorientations of molecules in disordered macromolecular solids. The insights obtained will be the basis for the rational design of improved materials and for controlling the interactions of macromolecular organic substances in the natural environment with contaminants and nutrients. Specifically, the new NMR instrument will enable the investigators to perform research on: 1) chain conformation, packing, and dynamics in amorphous synthetic polymers, and their effects on macroscopic materials properties, including physical aging; 2) the configuration and sequence distribution of polymers containing new polar, functionalized dienes; 3) nanometer-scale structures in technologically important heterogeneous polymer systems; 4) structure and dynamics in nano-composites of polymers with novel inorganic glasses of low glass-transition temperature; 5) the structure and improved properties of plastics from renewable resources; 6) the structure of soil organic matter, its formation, and its influence on the sorption of organic and inorganic contaminants; 7) mechanisms of carbon sequestration in soil, which can reduce atmospheric "greenhouse gases"; 8) the development of advanced, often multidimensional NMR pulse sequences to provide an "arsenal" for NMR analysis of organic solids with at least three-fold increased structural resolution. The diversity of the faculty collaborating in the use of this instrument will provide an excellent environment for students of chemistry, materials science, agronomy, and food science to learn and perform research in a stimulating interdisciplinary atmosphere.This award from the Major Research Instrumentation program to Iowa State University supports the acquisition of a 400 MHz Nuclear Magnetic Resonance (NMR) instrument. NMR is one of most powerful methods for analyzing complex organic materials. It uses the magnetic properties of the nuclei of many atoms. These nuclear magnets act as local "spies" reporting on their molecular environment, and they do so in response to radio-frequency pulses. These pulses can be designed to "tease out" specific information about the chemical structure, about nanometer-scale domains, or about motions of segments in the material under investigation. The new NMR instrument will help researchers to develop materials with tailored properties, such as less brittle biodegradable plastics, better membranes for use in fuel cells, strong plastics from renewable resources, improved adhesives, or lightweight materials providing increased fuel efficiency in vehicles. It will also enhance our understanding of how soil organic matter and fossil fuels are formed, and aid in the development of improved procedures for environmental clean-up and for the sequestration of "greenhouse gases" from the atmosphere. The diversity of the faculty collaborating in the use of this instrument will provide an excellent environment for students of chemistry, materials science, agronomy, and food science to learn and perform research in a stimulating interdisciplinary atmosphere.

新的400 MHz固态核磁共振（NMR）光谱仪由这个重大研究仪器奖支持，将使一个跨学科的研究团队在爱荷华州州立大学，以表征复杂的聚合物材料在前所未有的细节。特别是多维NMR将被应用于提供有关无序大分子固体中分子的化学结构、构象、链段间距离和重新取向的详细和定量信息。所获得的见解将是合理设计改进材料和控制自然环境中大分子有机物质与污染物和营养物质相互作用的基础。具体而言，新的核磁共振仪器将使研究人员能够进行以下研究：1）无定形合成聚合物中的链构象，堆积和动力学，以及它们对宏观材料性能的影响，包括物理老化; 2）含有新极性，官能化二烯的聚合物的构型和序列分布; 3）技术上重要的非均相聚合物体系中的纳米尺度结构; 4）具有低玻璃化转变温度的新型无机玻璃的聚合物纳米复合材料的结构和动力学; 5）来自可再生资源的塑料的结构和改进的性能; 6）土壤有机物质的结构、其形成及其对有机和无机污染物吸附的影响; 7）土壤中的碳固存机制，这可以减少大气中的“温室气体”; 8）发展先进，通常是多维NMR脉冲序列，以提供用于有机固体的NMR分析的“武器库”，其具有至少三倍增加的结构分辨率。 该仪器的使用将为化学，材料科学，农学和食品科学的学生提供一个良好的环境，在一个刺激的跨学科氛围中学习和进行研究。这个奖项从主要研究仪器计划到爱荷华州州立大学支持购买400 MHz核磁共振（NMR）仪器。核磁共振是分析复杂有机物的最有效的方法之一。 它利用了许多原子核的磁性。这些核磁体就像当地的“间谍”，报告他们的分子环境，他们这样做是为了回应射频脉冲。这些脉冲可以被设计成“梳理”出有关化学结构、纳米尺度域或被研究材料中片段运动的特定信息。 新的NMR仪器将帮助研究人员开发具有定制特性的材料，例如脆性较小的可生物降解塑料，用于燃料电池的更好的膜，来自可再生资源的坚固塑料，改进的粘合剂或轻质材料，以提高车辆的燃油效率。 它还将提高我们对土壤有机物质和化石燃料是如何形成的理解，并有助于制定更好的环境清理程序和从大气中隔离“温室气体”的程序。在使用这种仪器的教师合作的多样性将提供化学，材料科学，农学和食品科学的学生在一个刺激的跨学科的气氛中学习和进行研究的良好环境。